Systemd

(wikipedia.org)
In the following text an example service named vultrdata is used for illustrative purposes.
A service is defined in a file named like /etc/systemd/system/vultrdata.service. Unit files have a format like in this example:
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[Unit]
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Description=Vultr Instance Metadata Service
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After=network.target
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[Service]
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User=vultrdata
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WorkingDirectory=/opt/vultrdata
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Restart=always
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Environment=API_KEY=____________________________________
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ExecStart=/opt/vultrdata/vultrdata --addr 10.1.2.3 --port 8888 --userdata
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[Install]
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WantedBy=multi-user.target
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After creating the file in the /etc/systemd/system directory, issue this command to register it:
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$ sudo systemctl daemon-reload
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Then you can check the status:
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$ sudo systemctl status vultrdata
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● vultrdata.service - Vultr Instance Data Service
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   Loaded: loaded (/etc/systemd/system/vultrdata.service; disabled; vendor preset: enabled)
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   Active: active (running) since Sun 2020-04-05 19:35:56 UTC; 1 weeks 0 days ago
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 Main PID: 19694 (vultrdata)
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    Tasks: 16 (limit: 4661)
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   CGroup: /system.slice/vultrdata.service
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           ├─19496 /opt/vultrdata/vultrdata --addr 10.1.2.3 --port 8888 --userdata
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           └─19509 /opt/vultrdata/vultrdata --addr 10.1.2.3 --port 8888 --userdata
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Or start, stop, restart it:
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$ sudo systemctl start vultrdata.service
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$ sudo systemctl stop vultrdata.service
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$ sudo systemctl restart vultrdata.service
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You can enable or disable starting the unit/service on system startup:
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$ sudo systemctl enable vultrdata
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$ sudo systemctl disable vultrdata
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You can see/tail all systemd logs, or just for your service (unit):
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$ sudo journalctl -f
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$ sudo journalctl -f -u vultrdata
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Server Operating Systems

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